Open Carbonites options (type "/carb options" in chat, right click the Carbonite minimap button and choose "Options" in the menu, right click a non-icon area of any Carbonite map and choose "Options" in the menu) to the "Map Minimap" page, and look for the "Minimap docks in indoor areas" option, and check it. See if that helps.

The wording I gave for the option may not be exactly correct, since I'm not in-game at the moment to check it, but it should be similar.

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Ahhhh, the vagueries of the aging mind. Wait.... What was I saying?